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    • 1. 发明授权
    • Flash lighting unit for a camera
    • 相机闪光照明装置
    • US4464609A
    • 1984-08-07
    • US551491
    • 1983-11-14
    • Zenzo NakamuraTakashi UchiyamaShohei OhtakiTokuichi TsunekawaMasanori UchidoiYukio Mashimo
    • Zenzo NakamuraTakashi UchiyamaShohei OhtakiTokuichi TsunekawaMasanori UchidoiYukio Mashimo
    • G03B15/05H05B41/32H05B41/14
    • H05B41/325
    • A voltage detecting means is provided in a flash lamp firing circuit for detecting the attainment of the voltage of a storage capacitor to a satisfactory lamp firing voltage level to assure that a photographic camera associated with the flash lighting unit operates in a flash exposure range switched from a daylight exposure range only when a sufficient voltage is available to fire the lamp at the time of striking of the lamp. In one embodiment, the detecting means comprises two transistorized circuits having output terminals one of which is connected to the gate lead of a SCR in a discharge circuit of the lamp, and another output terminal which is arranged to be connectable to a light-emitting diode of the camera and therefrom connected to the gate lead of an electronic change-over switch for selection of the operating ranges of the camera, the light-emitting diode being arranged to be visible from the outside of the camera so that the operator is immediately aware if the storage capacitor voltage has attained the satisfactory firing level.
    • 电压检测装置设置在闪光灯点火电路中,用于检测存储电容器的电压达到满意的灯点火电压电平,以确保与闪光照明单元相关联的照相机在从 日光曝光范围仅在足够的电压可用于在点亮灯时点亮灯。 在一个实施例中,检测装置包括两个晶体管电路,其具有输出端子,其一个连接到灯的放电电路中的SCR的栅极引线,另一个输出端子被布置成可连接到发光二极管 并且由此连接到用于选择相机的操作范围的电子转换开关的栅极引线,所述发光二极管被布置为从相机的外部可见,使得操作者立即知道 如果存储电容器电压达到令人满意的放电电平。
    • 5. 发明授权
    • Electronic flash device with  capacitor discharge cut-off before full
discharge
    • 电子闪光器件在充放电之前具有电容放电截止
    • US4012665A
    • 1977-03-15
    • US613470
    • 1975-09-15
    • Zenzo NakamuraTokuichi TsunekawaShohei OhtakiTakashi Uchiyama
    • Zenzo NakamuraTokuichi TsunekawaShohei OhtakiTakashi Uchiyama
    • G03B15/05H02M3/338H05B41/32H05B41/29
    • H05B41/325H02M3/3384
    • The time period necessary to charge a current-to-light convertible energy storing capacitor to a certain voltage is reduced as compared with prior art devices. The energy storing capacitor is connected across a flash tube and switching element series-connected with each other. The switching element is provided with a control circuit, responsive to the voltage of the storage capacitor decreasing to a level at which the flash tube is stopped from producing flash light, for producing a terminating signal by which the switching element is brought into the open or non conducting state. With this arrangement, it is made possible to prevent complete discharge of the electric charge stored in the storage capacitor from occurring, thereby providing the advantage of saving a good fraction of the charging time period which would be otherwise necessary when the storage capacitor is completely discharged to zero voltage.
    • 与现有技术的装置相比,将电流对光可转换储能电容器充电到一定电压所需的时间段减少。 储能电容器跨越闪光管和彼此串联连接的开关元件连接。 开关元件设置有控制电路,响应于存储电容器的电压降低到闪光管停止的水平而不产生闪光,用于产生终止信号,通过该终止信号使开关元件进入开路或 非导电状态。 通过这种布置,可以防止存储在存储电容器中的电荷的完全放电发生,从而提供了当存储电容器完全放电时否则需要的充电时间段的很大一部分的优点, 到零电压。